In Russia the so-called Pirc Defence (1.e4 d6 2.d4 Nf6 3.Nc3 g6 or 1.e4 d6 2.d4 g6 followed by …Nf6) is usually called the Ufimtsev Defence or the Ufimtsev-Pirc. It is so named after the Soviet and Kazakh master Anatoly Ufimtsev, who was already pioneering this line in the 1930s.
Black’s idea in the Ufimtsev-Pirc is to lure White into building a broad pawn center and then undermining it. This concept finds clear expression in the Austrian Attack (1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3) and now lines such as 5…0-0 6.e5 Nfd7 7.h4 c5!. Other lines too have this sort of play, which at the time this defence was developed was considered quite revolutionary.
Here we see Ufimtsev using his line against the gambit expert Yakov Estrin. White builds an imposing looking center only to have it crumble: